* Dark Patches (Maria): These are vast, dark plains of solidified volcanic lava. They were formed billions of years ago when volcanic activity was much more prevalent on the Moon. The word "maria" is Latin for "seas," a name given by early astronomers who thought these areas were bodies of water.
* Light Patches (Highlands): These are the older, mountainous regions of the Moon. They are lighter in color due to their composition, which is mostly made of lighter-colored minerals.
Why do they appear different in color?
The difference in color is due to the reflectivity of the surface material.
* Maria: The volcanic basalt that makes up the maria is darker and less reflective than the material found in the highlands. This is why they appear darker.
* Highlands: The minerals in the highlands, such as anorthosite, are more reflective, giving them a brighter appearance.
In short, the light and dark patches on the Moon are caused by differences in the composition and age of the lunar surface.
